Trantec S4.04 Headset System Aerobic HM66 CH70 Black

Availability: Backorder

  • Trantec S4.04 Headset System Aerobic HM66 CH70 Black, Trantec's simplest plug and play system.
  • Designed to launch you into the world of wireless.
  • Comes with an HM66 Headset Microphone, a state of the art Beltpack Transmitter and a UHF wireless diversity receiver.
  • Features an Enhanced Frequency Bank system with up to 4 compatible licence-free frequencies.
Our price £269.00 £224.17
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Trantec S4.04 Headset System Aerobic HM66 Channel 70

The S4.04 Series Headset system comes with an HM66 Headset Microphone, a state of the art Beltpack Transmitter and a UHF wireless diversity receiver.

  • Featured is an Enhanced Frequency Bank system with up to 4 compatible licence-free frequencies.
  • All built on synthesised PLL quartz tuning technology.
  • Fully utilises the limited space available on Channel 70 whilst maintaining guard bands to protect from adjacent channel interference.
  • Simple Easy Lock system to synchronise multiple transmitters to receivers.


Aerobic Headworn Microphone


  • The HM-33 has been designed primarily for the active professional who needs a hands-free operation.
  • It remains in place and feels secure. Suitable for people in sports, journalism, event organising and presentations.
  • The sound quality is pure and does not react to voices where sibilance would otherwise be a problem.
  • It is comfortable to wear over extended periods.
  • The HM33 is perfect for those applications which require a high-performance cost-effective solution.
  • Supplied with a Black foam windshield.

Beltpack Transmitter S4.04


  • Part of a fully integrated system
  • Transmitter cover unhinges to reveal
    1. Selected channel number,
    2. Infra-red port to communicate with receiver
    3. Set button to change frequency
    4. Gain control to correct different signal level situations
    5. AA Battery 3.5mm
  • MiniJack input accepts a wide range of pickups, alternative microphones and other electronic gear
  • Gain Control makes it possible to use any alternative electret microphone using a 3.5mm Mini Jack plug Mic input provides a phantom power voltage for electret microphones.
  • Range of up to 100 metres Rear Belt Clip ensures beltpack will remain in place
  • One AA battery gives up to 10 hours at full performance
  • Low Battery Status indication relayed to receiver 3.5mm jack socket with heavy plated contacts for absolute reliability
  • Aerial tuned to carrier frequency for maximum efficiency.

Receiver S4.04 series


  • Diversity reception automatically switches between antennas A and B for best reception
  • Up to four channels can be used simultaneously without interference Antennas can be set at any angle to maximise best reception.
  • V formation is usually best Automatic frequency scan searches for the four clearest frequencies LEDs show AF peak level, active channel number and which diversity channel A or B is active Signal Squelch automatically mutes when carrier is not present
  • Simple Sync locking procedure. Manual and automatic. Locks chosen transmitter to receiver Audio outputs, XLR balanced and Jack unbalanced.

Get Connected

MiniJack Leads to interface your Trantec Beltpack with external devices

MiniJack Plug to Neutrik female XLR 2 metres Code 574100
MiniJack Plug to Neutrik male XLR 2 metres Code 574110

MiniJack Plug to Neutrik Mono Jack plug 0.8 metre Code 594970
MiniJack Plug to Phono plug 2.5 metres Code 574030
MiniJack Plug to Stereo Jack socket 2 metres Code 594590
MiniJack Plug to MiniJack socket 3 metres Code 595170

Various accessories are available to enhance the performance and adaptability of the system

Trantec continue to lead the Radiomic industry with their innovation, consistent performance and build quality. Their products are literally second to none and with the company being UK based, their technical support is the benchmark of the Pro Audio Industry.


What’s in the Box:

  • Aerobic HM66 Headworn Microphone
  • Beltpack Transmitter
  • Receiver
  • Receiver Power Supply
  • Operating Manual 



Beltpack Transmitter 

  • RF Carrier Power 10mW
  • Audio Frequency Response 50Hz – 1.5kHz
  • Audio Input Level -6dBV (maximum), mic gain 0dB
  • Battery Life Approximately 10 hours
  • Power Supply 1 AA size battery, 1.5V
  • Finish Resin, coating
  • Dimensions 62(W) x 100(H) x 25(D)mm
  • Weight 85g with battery


  • Diversity Reception   Antenna Diversity
  • Sensitivity  10uV at 45dBA, S/N
  • Squelch Tone SQ, Carrier SQ, Noise SQ
  • Audio Frequency Response  50Hz – 15kHz
  • Audio Output Level (Max.) Balanced (XLR): -20dBu, Unbalanced(1/4″ jack socket): 10dBu 
  • Power Supply 12 VDC 500mA
  • Dimensions 215(W) x 39(H) x 102(D)mm
  • Weight 480g


Channel 70 is Licence free

Wireless Microphones can tune into frequencies that do not require a licence to operate. There are several licence-exempt areas for PMSE use. (Programme Making and Special Events)

The UHF licence-exempt range is 863.100-864.900 MHz.

This is within Channel 70 which has little spectrum assigned to it so limiting the number of users to four.

The power is limited by legislation to 10mWatt.

There is no limitation to how many frequencies can be used in this channel as long as users stay within the confines of the band.

More users could be squeezed in but that would jeopardise clear reception and interference from adjacent channels.

There are currently no plans to remove access to Channel 70; it will continue to be licence-exempt for PMSE users.

Channel 70 is adjacent to the use of mobile in the 800 MHz band.

There should not be any interference however this is the risk taken with the licence-exempt channels.

More Information
Color Black